package cn.itcast.hotel.service.impl;

import cn.itcast.hotel.mapper.HotelMapper;
import cn.itcast.hotel.pojo.Hotel;
import cn.itcast.hotel.pojo.HotelDoc;
import cn.itcast.hotel.pojo.PageResult;
import cn.itcast.hotel.pojo.RequestParams;
import cn.itcast.hotel.service.IHotelService;
import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.geo.GeoPoint;
import org.elasticsearch.common.unit.DistanceUnit;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.QueryStringQueryBuilder;
import org.elasticsearch.index.query.functionscore.FunctionScoreQueryBuilder;
import org.elasticsearch.index.query.functionscore.ScoreFunctionBuilder;
import org.elasticsearch.index.query.functionscore.ScoreFunctionBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import javax.naming.directory.SearchResult;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

@Service
public class HotelService extends ServiceImpl<HotelMapper, Hotel> implements IHotelService {
    @Autowired
    private RestHighLevelClient client;
    @Override
    public PageResult search(RequestParams params) {
        try {
        //准备request
        SearchRequest request = new SearchRequest("hotel");
//        //准备DSL
//        String key = params.getKey();
//        if (key == null || "".equals(key)) {
//            request.source().query(QueryBuilders.matchAllQuery());
//        }
//        else {
//            request.source().query(QueryBuilders.matchQuery("all",key));
//        }
        //准备query
            buildBasicQuery(params,request);
        //分页
        int page = params.getPage();
        int size = params.getSize();
        request.source().from((page - 1) * size).size(size);

        //排序
        String location = params.getLocation();
            if (location != null && !location.equals("")) {
//                System.out.println(location);
                request.source().sort(SortBuilders
                .geoDistanceSort("location",new GeoPoint(location))
                .order(SortOrder.ASC)
                .unit(DistanceUnit.KILOMETERS)
                );

            }
        // 3.发送请求
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        // 4.解析响应
        return handleResponse(response);
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}

    // 结果解析
    private PageResult handleResponse(SearchResponse response) {
        // 4.解析响应
        SearchHits searchHits = response.getHits();
        // 4.1.获取总条数
        long total = searchHits.getTotalHits().value;
        // 4.2.文档数组
        SearchHit[] hits = searchHits.getHits();
        // 4.3.遍历
        List<HotelDoc> hotels = new ArrayList<>();
        for (SearchHit hit : hits) {
            // 获取文档source
            String json = hit.getSourceAsString();
//            System.out.println(hit);
            // 反序列化
            HotelDoc hotelDoc = JSON.parseObject(json, HotelDoc.class);
            //获取排序值
            Object[] sortValues = hit.getSortValues();
//            System.out.println(sortValues[0]);
            if (sortValues.length > 0) {
                Object sortValue=sortValues[0];
                hotelDoc.setDistance(sortValue);



            }
            // 放入集合
            hotels.add(hotelDoc);
        }
        // 4.4.封装返回
        return new PageResult(total, hotels);
    }
    private void buildBasicQuery(RequestParams params,SearchRequest request){
        //构建 BooleanQuery
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        // 关键字搜索
        String key = params.getKey();
        if (key == null || "".equals(key)) {
            boolQuery.must(QueryBuilders.matchAllQuery());
        }else {
            boolQuery.must(QueryBuilders.matchQuery("all",key));
        }
        //城市条件
        if (params.getCity() != null && !"".equals(params.getCity())) {
            boolQuery.filter(QueryBuilders.termQuery("city",params.getCity()));

        }
        //品牌条件
        if (params.getBrand() != null && !params.getBrand().equals("")) {
            boolQuery.filter(QueryBuilders.termQuery("brand", params.getBrand()));
        }
        // 星级条件
        if (params.getStarName() != null && !params.getStarName().equals("")) {
            boolQuery.filter(QueryBuilders.termQuery("starName", params.getStarName()));
        }
        // 价格
        if (params.getMinPrice() != null && params.getMaxPrice() != null) {
            boolQuery.filter(QueryBuilders
                    .rangeQuery("price")
                    .gte(params.getMinPrice())
                    .lte(params.getMaxPrice())
            );
        }
        //算分 加成
        FunctionScoreQueryBuilder functionScoreQuery = QueryBuilders.functionScoreQuery(
                boolQuery,
                new FunctionScoreQueryBuilder.FilterFunctionBuilder[]{
                        new FunctionScoreQueryBuilder.FilterFunctionBuilder(
                                //过滤条件
                                QueryBuilders.termQuery("isAD", true),
                                //算分函数
                                ScoreFunctionBuilders.weightFactorFunction(1000)
                        )
                }
        );
        request.source().query(functionScoreQuery);


        //存入
//        request.source().query(boolQuery);

    }


}
